CVE-2012-0944 in Aptdaemon
Summary
by MITRE
Aptdaemon 0.43 and earlier in Ubuntu 11.04, 11.10, and 12.04 LTS does not authenticate packages when the transaction is not simulated, which allows remote attackers to install arbitrary packages via a man-in-the-middle attack.
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Analysis
by VulDB Data Team • 12/03/2021
The vulnerability identified as CVE-2012-0944 represents a critical authentication flaw in Aptdaemon, a package management component used in Ubuntu distributions from version 11.04 through 12.04 LTS. This issue stems from the improper handling of package authentication during non-simulated transactions, creating a significant security gap that remote attackers can exploit to install malicious software. The flaw specifically affects systems where package management operations occur without the safety net of simulation mode, leaving the authentication process vulnerable to manipulation.
The technical root cause of this vulnerability lies in Aptdaemon's failure to validate package authenticity when transactions proceed to actual installation rather than simulation. When users initiate package management operations through the graphical interface or command line tools that rely on Aptdaemon, the system should verify package signatures and integrity before proceeding with installation. However, in versions prior to 0.43, this verification process is bypassed during non-simulated operations, allowing attackers who can intercept network traffic to substitute legitimate packages with malicious ones without detection. This authentication bypass occurs at the protocol level where package metadata and signatures are not properly verified before execution, creating an attack surface that aligns with CWE-310.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables full system compromise through supply chain attacks. Attackers can leverage man-in-the-middle positioning to replace legitimate software packages with malicious variants, potentially installing backdoors, rootkits, or other persistent malware. The attack vector is particularly dangerous because it operates at the system administration level, where package installation typically requires elevated privileges, making it an attractive target for attackers seeking long-term system access. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under software supply chain compromise and privilege escalation categories.
Systems running Ubuntu 11.04, 11.10, and 12.04 LTS are particularly vulnerable due to their widespread adoption in enterprise and government environments where package management operations are frequent and critical. The vulnerability affects not just individual user systems but also automated deployment scenarios where package installations occur without manual verification. Organizations using automated package management tools that rely on Aptdaemon without proper security controls face increased risk of unauthorized software installation. The lack of authentication during actual installation operations creates a persistent threat that can be exploited repeatedly without detection, making it particularly concerning for environments requiring strict security controls and audit trails.
Mitigation strategies for this vulnerability include immediate patching to Aptdaemon version 0.43 or later, which implements proper authentication verification for all package transactions. System administrators should also implement network-level security controls such as encrypted communication channels and certificate pinning to prevent man-in-the-middle attacks. Additional measures include monitoring package installation logs for unauthorized changes, implementing network segmentation to limit attack surface, and establishing secure software distribution channels with proper signature verification. Organizations should also consider implementing automated patch management systems to ensure timely deployment of security updates. The vulnerability highlights the importance of proper authentication mechanisms in system administration tools and demonstrates how seemingly minor implementation flaws can create significant security risks that affect entire operating system distributions.